To link to the entire object, paste this link in email, IM or documentTo embed the entire object, paste this HTML in websiteTo link to this page, paste this link in email, IM or documentTo embed this page, paste this HTML in website

Bryozoa of the Pacific coast of America

Bryozoa of the Pacific coast of America, Disporella astraea, new species, p. 719

NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 719
form around the central area, and vary in size from 2 to 6 tubules, considerably elevated above the central area which is somewhat concave.
The zooecial apartures measure 0.10 mm in diameter. The larger cancelli are of about the same size, but most of those in the central area
are partially closed, with a smaller rounded central pore; there are
usually two rows of cancelli between the radii. The zoids around the
border are not at all elevated and in most cases are indistinguishable
from the cancelli. There is a narrow basal lamina.
The zoaria are evidently young, as there are no ovicells, and there is
a question whether the species is the same as L. octoradiata Waters. The
nature of the closure of the cancelli appears to relate it to Disporella
rather than to Lichenopora.
Waters described the species from 71°09' S. Lat., 89° 15' W. Long.,
and Borg recorded it questionably from 63°57,S, 61°50'W; both of
these records are from the area between South America and Antarctica.
Hancock Station 481, Cartago Bay, Albemarle Island, Galapagos, at
12 fms, two colonies.
Disporella astraea, new species
Plate 76, figs. 1 and 2
Zoarium encrusting with a broad base and rising by vertical budding
into a short cylindrical stalk which, with the radiating fascicles, gives
the appearance of a minute Astraeid coral. The central area is flat with
numerous thick-walled and rather wide open round cancelli, which extend
between the rays in two or three rows. The flat top is surrounded by a
ring of 10 high, short fascicles. The fascicles are groups composed of
4 to about 10 zooecial tubes which are all closely connate, their apertures
about 0.07 mm in diameter; the apertures of the cancelli are about the
same size, occasionally larger. The encrusting base is 2 mm in width;
the primary zoarium arising from it 1.30 mm wide and about 0.60 mm
high; the secondary zoarium or vertical bud is 1.10 mm in diameter and
about 0.80 mm high.
There is no evidence of an ovicell, and therefore the disposition of the
species in Disporella is questionable and based merely on zoarial characters.
Type, AHF no. 129.
Type locality, Hancock Station 451, off Post Office Bay, Charles
Island, Galapagos, at 100 fms, one colony. Another somewhat smaller
colony at Station 461, off Tagus Cove, Albemarle Island, Galapagos,
at 80 fms; this specimen has 9 slightly smaller and higher fascicles, but
otherwise is similar.

NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 719
form around the central area, and vary in size from 2 to 6 tubules, considerably elevated above the central area which is somewhat concave.
The zooecial apartures measure 0.10 mm in diameter. The larger cancelli are of about the same size, but most of those in the central area
are partially closed, with a smaller rounded central pore; there are
usually two rows of cancelli between the radii. The zoids around the
border are not at all elevated and in most cases are indistinguishable
from the cancelli. There is a narrow basal lamina.
The zoaria are evidently young, as there are no ovicells, and there is
a question whether the species is the same as L. octoradiata Waters. The
nature of the closure of the cancelli appears to relate it to Disporella
rather than to Lichenopora.
Waters described the species from 71°09' S. Lat., 89° 15' W. Long.,
and Borg recorded it questionably from 63°57,S, 61°50'W; both of
these records are from the area between South America and Antarctica.
Hancock Station 481, Cartago Bay, Albemarle Island, Galapagos, at
12 fms, two colonies.
Disporella astraea, new species
Plate 76, figs. 1 and 2
Zoarium encrusting with a broad base and rising by vertical budding
into a short cylindrical stalk which, with the radiating fascicles, gives
the appearance of a minute Astraeid coral. The central area is flat with
numerous thick-walled and rather wide open round cancelli, which extend
between the rays in two or three rows. The flat top is surrounded by a
ring of 10 high, short fascicles. The fascicles are groups composed of
4 to about 10 zooecial tubes which are all closely connate, their apertures
about 0.07 mm in diameter; the apertures of the cancelli are about the
same size, occasionally larger. The encrusting base is 2 mm in width;
the primary zoarium arising from it 1.30 mm wide and about 0.60 mm
high; the secondary zoarium or vertical bud is 1.10 mm in diameter and
about 0.80 mm high.
There is no evidence of an ovicell, and therefore the disposition of the
species in Disporella is questionable and based merely on zoarial characters.
Type, AHF no. 129.
Type locality, Hancock Station 451, off Post Office Bay, Charles
Island, Galapagos, at 100 fms, one colony. Another somewhat smaller
colony at Station 461, off Tagus Cove, Albemarle Island, Galapagos,
at 80 fms; this specimen has 9 slightly smaller and higher fascicles, but
otherwise is similar.